LM317LMX/NOPB datasheet by Texas Instruments

LM317LMX/NOPB Frequently Asked Questions (FAQs)

• What is the maximum input voltage that the LM317 can handle?
  The maximum input voltage for the LM317 is 40V, but it's recommended to keep it below 35V for reliable operation.
• How do I adjust the output voltage of the LM317?
  The output voltage of the LM317 can be adjusted by using a resistive divider network between the output and the adjust pin. The formula to calculate the output voltage is Vout = 1.25 * (1 + R2/R1).
• What is the minimum input voltage required for the LM317 to regulate the output voltage?
  The minimum input voltage required for the LM317 to regulate the output voltage is 3V above the desired output voltage.
• Can I use the LM317 as a current regulator?
  Yes, the LM317 can be used as a current regulator by adding a current sensing resistor in series with the output. The current limit is determined by the voltage drop across the resistor.
• How do I protect the LM317 from overheating?
  To protect the LM317 from overheating, ensure good heat sinking, use a heat sink with a thermal resistance of less than 10°C/W, and keep the device within its recommended operating temperature range.